None of us buy our M3's as resale investments. I already consider my car worthless on the resale market, but I will admit the "factory" car will hold a better value. However, when you go to sell this factory car -- outside of the show-car and concourse circuits, you're going to have a near-impossible time finding a buyer that will pay a 50% + premium for it. Joe Sixpack has no idea why you're asking $100k on the aftermarket for an M3 -- and he won't care. He'll just say no.

Exactly I don't know anyone that buys car for resale value... I'd rather take my already modified M3 and put some Recaro seats and better suspension maybe even buy the one from this GT4 and accomplish the same thing.